It sounds like you have them on Moderation so you have to approve each post...
In each of your forums, check to see if you have the Moderate Posts radio button checked... Uncheck that button. Then moderate all their posts so they can see them...
Check it in the Forum Manager, click on the forums, in the Moderate Options you would want Moderate Posts to be "no" so that you don't have to approve each post by the users.
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